09a263e607
git-subtree-dir: deps/memkind/src git-subtree-split: bb9f19dd1b3ed6cc5e1b35919564ccf6f4b32f69
75 lines
3.3 KiB
Python
75 lines
3.3 KiB
Python
#
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# Copyright (C) 2017 Intel Corporation.
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are met:
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# 1. Redistributions of source code must retain the above copyright notice(s),
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# this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright notice(s),
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# this list of conditions and the following disclaimer in the documentation
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# and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY EXPRESS
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# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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# EVENT SHALL THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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# PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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# LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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# OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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from cmd_helper import CMD_helper
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import os
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import itertools
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"""
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Huge_page_organizer sets hugepages per NUMA node and restores initial setup of hugepages.
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It writes and reads from the same file, so using Huge_page_organizer with parallel
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execution may cause undefined behaviour.
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"""
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class Huge_page_organizer(object):
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cmd_helper = CMD_helper()
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path = "/sys/devices/system/node/node{0}/hugepages/hugepages-2048kB/nr_hugepages"
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restore_values = []
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def __restore(self):
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"""Restore initial setup of hugepages."""
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for node_id, restore_value in enumerate(self.restore_values):
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self.__set_nr_hugepages(node_id, restore_value)
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def __get_nr_hugepages(self, node_id):
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"""Return number of hugepages on given node or None if given node is not configured."""
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if not os.path.isfile(self.path.format(node_id)):
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return None
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with open(self.path.format(node_id), "r") as f:
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return int(f.read())
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def __set_nr_hugepages(self, node_id, nr_hugepages):
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"""Set hugepages on given node to given number. Return True on success, False otherwise."""
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command = 'sh -c "echo {0} >> {1}"'.format(nr_hugepages, self.path.format(node_id))
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output, retcode = self.cmd_helper.execute_cmd(command, sudo=True)
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if retcode:
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return False
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return self.__get_nr_hugepages(node_id) is nr_hugepages
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def __init__(self, nr_hugepages_per_node):
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"""Save current hugepages setup and set hugepages per NUMA node."""
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for node_id in itertools.count():
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nr_hugepages = self.__get_nr_hugepages(node_id)
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if nr_hugepages is None:
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break
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self.restore_values.append(nr_hugepages)
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retcode = self.__set_nr_hugepages(node_id, nr_hugepages_per_node)
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if not retcode:
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self.__restore()
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assert retcode, "Error: Could not set the requested amount of hugepages."
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def __del__(self):
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"""Call __restore() function."""
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self.__restore()
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